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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afe1fbead7259ffdb4a37cda8db9d0e2a1c72c03160d03ef7a8cdad6618b2d1' 
  AND token = 'bvP5RQ3e0derASwC/eldXl5SrdGXNIwFoQIzuH8SBK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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