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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10530a617f54eb53c5aa05ad3830d8c1075939739a68ac6708b46a3dd65a106e' 
  AND token = 'FLZKRJfO0Jp9tQF+PvHlt47ev75+QeETiQj/OY+7LqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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