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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54a6917e517e7c8b6b7988e18d1a5266fb57ecf42865342f9523d9174258e5c' 
  AND token = '0m+8KJFYxws69encIFPeSGi8YpBgekDgiai7PDkB3iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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