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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314bb958dc28373f47498c96d6da3e5808efb396c5098246c3ba3e273aa8d707' 
  AND token = '7SclcYxq2HbFL811Pw7C0FI7IdhjiV9SFLwKYylZi2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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