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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e1d9c09a88f2def9eeba4e87a63f9a1c329ec94340cc6050f314e0f9fbf29e' 
  AND token = 'lY+iSBFjZJjmJN8yPYkJYoiuVqf2gzx+0PxdkN1ohn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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