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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300efc45748a5adb97cfbd95a91a601a9e4a2cb8a85fe42d963837f8feb73d1b' 
  AND token = '/WVs6T2iJUGM1LQzjL8uErzhTsVrklLKsMUX9AAHIl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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