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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc0b53788fab15fc5571bc351c254f4da8034adde13a8cb329a8cbab545d7b4' 
  AND token = 'cBOxEU4r+BmEom5FawmYe1fQt0bMmYq97U7PeKtzsy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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