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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d11dce0d46f28bd9a424d5573da45399f349275b00cbc0fb2c89a063c29c00' 
  AND token = 'pt8H5qMRzVxgX6rH/1+c6FSeqsEbPhjaacOlr/xesk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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