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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064000d310707f8c91b3a7fad07b4594313afd521144c4543603e108719c53de' 
  AND token = 'MQ+naDjNhrghxytrE13yCrMBrQu6xF3FIojYBEmLahw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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