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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0da2a1576c11664011bb9d8fe4ba269cd31f8aeda7baf83556ed9278064517a' 
  AND token = 'UBXpaQKa+YtHmO8WVoWer+At3xTYqObqJ02fx2B6/5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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