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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a01f4447c8450219a255204182587d854c2b010fe44d4eec2c9dfe52d02f35d' 
  AND token = 'asXPJs5PxD+GfT816aMYqUSo1gl5kH8l4NbkpKs6bfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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