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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a3b5eb5a73f19fcf5271174074b778368312f84e41aa80ac97dddda1c2fef8' 
  AND token = 'kOfTUxyLKORna7VyPwZGHJbKeKUIhbb55fsE91yXtpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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