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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b683f986b8f63a1b7c45fe92e27cd7a0011d4881804a9193d7b22361eb8059' 
  AND token = 'dXHfIaG4ptq83CdoERGp0taghaxISLDIFG+DcAC9qWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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