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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e873b23dade926bd1f9d133cb4069d3635d9de88bd2b8c41908cefca5dc34f' 
  AND token = 'VZELE0QsCMPo1PfvkCrxKWh9gCb3gltnw5GwvS9vNyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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