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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86b41a8bbd97bacac4deedb4e6c33cdbbcb29a102b58365c950888500e9c353' 
  AND token = '5F14Gn04yPJvywisMxfbb2w+YH7HwuJgp0UnLCsRM1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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