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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171a8b4c953dc3f53ba84bc569bc11a3fa36835a2ec8ae8feb99181611f226d3' 
  AND token = '8nbBW8fc1ocyWfdB4Q5V5PZfF2ceLHa7P88yOl3u70c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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