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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9327c0df60dc5491babb7144ad48360ff4914dee651ddc1c4ec1dc3914ab4923' 
  AND token = '6tNVh8bGxoDDSbpy/EYoO/5cslMn3C8020LsXoIrOuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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