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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054c7f1adbf7c8ad6cc17cb05939ef1aab5ab1ca3e7ec04a06df451072c0103f' 
  AND token = '8qY1eV52fXFbXpHyp+Z9uVrqnc3QRFDcxSn86fd3Ebo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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