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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53a6353056dc4c60af78991e1056c8d64ad9098f49b37ca70fc9b4a32dcf4714' 
  AND token = '9WALfN4PUHcW/bwIj/aLX5PltVehCAn5PO1+B26qN6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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