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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff07f85744929ee752ebb01839bc2f972413772730f59c39f653b850400a01ab' 
  AND token = 'f/RNLLmOlwc1LfU5Lvufm/kq+nzWc8MtzXkkVVpQlWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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