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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f1aef3bbd8e9049555be018f9c9b62d5878a14c8122ab9a32966300e9efb45' 
  AND token = 'LcdrZnp4nNRMDdAF6CEOz0l6NSPYct+NE14K6VrjSzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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