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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d214fa6a76a588b21a8c80e6e0312e2ebf97aee0276e181fe4e07506d990fca' 
  AND token = 'ZeQ4c1ZmPPZsV2cy2MenvPa60WnfXp+DpPOtLKkOdfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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