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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f8c2586c3dde8ac910a81340c93b45a0b2a6ba20001ab94b97391dbaa29d5c' 
  AND token = 'c8MF5yZWkDnFvcC93Uz0LnhBaac37zoiDUGGnONePNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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