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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a173dfd905f3bbc6e38dc7ecae6166a21bbc567ef667d3ecb91a2e453fe35e6' 
  AND token = 'R8n5E+pkU/aQI43ooUvTHrhBAB7VkVfzrmrL/11uDmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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