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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88cec90a716940dfef8787d217f3529b475f6fdc328dba435a5ad0b98fcdd0a7' 
  AND token = 'KCdvJliWHqQkthDgPNQ7SZ6dng56KJqDWsliE6M7s4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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