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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff26569d0c77118eb8040e2007a427fe08538b6f1e8d8f323cf1dab0ea6a7480' 
  AND token = 'GwJQsj5yNSwpcuDCPTI2ssuyKSsajtYDO0ExbtrdE5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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