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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ea02fa6a90640421477d3ed3cf3ea5ad6a162494307a0a3471e79e318d350a' 
  AND token = '9kijOzHN+9hIo60QyA1S3gl6pcjE9NfazELPGDEUrp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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