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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79f94869c23592ec9fc0a5a9bc23d0a064835cfc9b0db974f4b8d0206fc0813' 
  AND token = '+ovFs0ebLYV3AvaKxOox3Lad1/mW+cMWqQuDNW1naxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00187

JSON explain

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