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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604bddd3bd24244368aa1d89a79af52242a8a91cf2b1c8fdefb5dd6d3d07bc01' 
  AND token = 'ypI85GzZuQkGZ0/ste1OYFcSaULGL6b6045nmblp6A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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