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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865dc94dd4a0800e1b5f92aedacf3e3a9b9bc94dfbb673b01a10c7f158a227a8' 
  AND token = '+kSxmGsIrHJbxX3xWg5gy3OBbpo29cZ15TeCKl7+stQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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