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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa03733439db1cf5876eb7d9e7288691935edb4af02bfaa6452fece23d75265a' 
  AND token = 'cT/jConIIRy0o4vAKEcAPedkm66wWcm3n0fcoz+UQJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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