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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b74211d6061d2febd18aef6a38ebdc93ccd08afe3f6ad3d25f82a2330d90b3' 
  AND token = 'ZCxq3iDDuycAs2xF5bY3sMpOq2vITUHHR+WtnuuWAYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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