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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ebf3007ea99e67ed412ca415ed6d32897d28fd121859f75bd03316a0866da2' 
  AND token = 'lU8ctwjOQOflLljWcc7FeJL/7x1+iG/TcRzYOvz5XGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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