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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f3565dec862650a83d789ea793d6328af85c245382f86b202c643a5133091b' 
  AND token = 'J04pNQ8RMB6LxxQUbCujzMeCTWgqWHmrSVH7E+ECxVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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