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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73925184d9fd4fa4f2b65a1850d68297458e0adc3072fa7451be2161b3281f8' 
  AND token = 'KC9Rl83WdWnpZj5BgpjoMDf8PtGeNpN2D0a60T737dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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