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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c07878494c5a5f667fc4d60fa9f758ab6e82a341bc3c284973ab3054a4dc469' 
  AND token = 'FkdkXYhDWIFE3nfhi1YmFa1aesI4smrnMEZLpazA2+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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