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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9bce726a2997bbd0735cce8f079efd0330358ff996fd4c130bff2da0675a0f' 
  AND token = 'b4E8MqmHWSBG71oTnxxMH2hljZ61KMiUg6oYsxFWjes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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