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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9712e430d77fa86c0e318f2e87283c643fce355c77aea4f6263b7e956804a5' 
  AND token = '9ZdmZMqpYgM9ayM1OdvAS73oiMHAp4B5UclGy+D07uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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