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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b66346e88976bbbd3519a74a16b074ad1b35af9c8ed5ef85d62baf1ac7d7bc9' 
  AND token = 'ex5Ana0oXLzRyujifOaAI8RtC7j5ueRj5mRNueD1q4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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