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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d598f9a4aa29dde1893c52b8fbcbaea02b4b7fcbfe0c6c76b5407aaa4137e39' 
  AND token = 'VsqDyT9NhYT3P4ivDh459cm3rik6B3CiNa+4fuJ9V/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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