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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc4ecb1acf1c8db6e8dd619ce0798dd28a0041709f975df99b44f3b0751ea4c' 
  AND token = 'KB17iR01TnPhtRceVZl+R7bM6tLcs7ByKa7KWhsvZbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}