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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7126220a981c64e6c4fe5fab5f4d052063d6b847ef33908e429bcc7dee90b3d6' 
  AND token = 'Czu3ClWX+IBGOUarCl8sBxRM8/QgiRzlG5CY8Qe5Oyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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