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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7b45ff68aef0d477105bfcefdd2ab632b898215712df99c7b81524220dd969' 
  AND token = 'T/fJ1mwEAMIGemtCbCV07pPTujNonuW9yf5PNlJH9hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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