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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d7b3ad8c187501b9891d4e538e4a058e15a06c670a127a2829e531caf05e72' 
  AND token = 'wljJ2dWNwKnViUokwVVyhYskh5bS+9gol5vXVJxTcVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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