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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e99909ea7d7eb374c2607d74d4a9c34b50a5d504df4aacf46904eeee1a10e4' 
  AND token = 'ur6tT35IO3x4hf7LO36rLtP81LfXQO9ssf55cZWTT/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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