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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5206aa484d8d266a8fc534a99a9c31a122e9c3b0fb8d556d666d9fbbab484f90' 
  AND token = 'YXNRuVOJnkqSq7IS3Go59tQoAD5bruK5u2/cfNYLFVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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