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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afbbe83ed712ee08871dbd5cba6649b552ed1d0f2b641bbbd4659e73dc1b488' 
  AND token = 'tKE9eUWbLz8wDNVUy9T2J5BwpRmhpFJWTwjx5sumJqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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