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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72daa71974181021fa5856b9b9bb8b51c5f786eaebb6f0a1aeba3e055418bcc' 
  AND token = 'UGsV+pxcmzo9YAc5ubmV/HKq5MZ5+yx881luMhjiHtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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