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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8406d0b60f1471d95d89c3f0ff9183c2bfb6c8bca5375da6271c4a4ff5f75b' 
  AND token = 'zUBMF0YRNHf3f2gXbvAif9ocnCL7EpRt2WXrRo0sAw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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