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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b05ef28eaf80174df0384fc2670c4ed3e9f760fa78b2348908ceb6fb7cee8c4' 
  AND token = '04x0geAer5fT9csv1a2LVQWWYuwReaJmVgP8TAuA96s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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