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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbe27d65b7e317668a46e0d3c44ae4956f10b9a524d1f8cd88ffcd8d7d7c5ad' 
  AND token = 'Kh1t9kry9dWD4RnI0zEIiifgCQT5kbB321QusruZrGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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