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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896ceec130fce3f0abb8db5c73f64d56c88a232d70b729ba852f984201f9305b' 
  AND token = 'CONv9T/YY8pcjbRoy1AAH/b7kHZMi8ybMdOtdH0T4Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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