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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24c43f591cd686f223d14786d47bd8a091e75986d628c7c0ed3701671ff02c0' 
  AND token = 'NaGf+eOhDZieSnY3s2bldHb+2dd83RCXxJFF/vhjwp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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