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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee0504e7f15dbff9c6e64f9f19d47517bb590bb732f8e3cdbdc3c041e70e1f2' 
  AND token = 'xLRQoc8Hp0Q87t+CPrXF95z3fKBviQ8uEmQk+PwVU6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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