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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ac8f6196e6e9523e81c982d3d7293954f53c0831d290b69f8c20fd3aeb3e3b' 
  AND token = 'sSrXT3tBX2jfrCbFum1A9euELl2kBGUhO7x7jCmOvaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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