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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f76b562a565a8133d9d4a90b5b4b8647ec523e8bdb1faf1fbb79bedeb92529' 
  AND token = 'mz8dGozEed66ipxq8IN3zDUHcd3DfBT8ETDyWfojdmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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