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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf030a0f658c4e78768b53e59b54d97b81bbff1d6a793c6b7dd130626cda481' 
  AND token = 'maTEvBljPQU1LkM2/s9ccM9O0I8OBKwSs1TbOtO2vj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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