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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a15a01fb8252d9a1c8de5f500c4de4d6ec4e10d84d4c13cec7c20533543ed78' 
  AND token = 'ai91W8VPW/dIMbz6qOP4pU/T/UC5O4NC/vcoD7fVRaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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