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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77cd7aa372f91ad89b0615e7bb95ab3c2316670be9cb49afb13fd07dda00031' 
  AND token = 'tOzvZKpyJW+QB8DA5t+8rz8EUKxDyR9kJ2MYn7L2RkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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