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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6151bc9a19ffe3c0baee6e7fba5aa96f3ddc18070387cd529c87f1ce98fc5555' 
  AND token = '6tdAXLGaLgJlCD/9RP83B0Ug56HIFRoiBxEkTkknsSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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