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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9ced4af74cdb0ea37dbc265b79908d3057a68ea33a2c540b105bcda293a94c' 
  AND token = 'A3UObJgjtK72c0n5vqvzJb2bRLQ1nZ9jyEQYH9lbFUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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